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Film Mulching with Low Phosphorus Application Improves Soil Organic Carbon and Its Decomposability in a Semiarid Agroecosystem

Author

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  • Yan-Jie Gu

    (Department of Grassland Science, College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

  • Cheng-Long Han

    (State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China)

  • Meng Kong

    (Key Laboratory of Organic Dry Farming of Shanxi Province, Shanxi Institute of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan 030031, China)

  • Kadambot H. M. Siddique

    (The UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6009, Australia)

  • Feng-Min Li

    (State Key Laboratory of Grassland Agro-Ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
    College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China)

Abstract

Soil organic carbon (SOC) storage and decomposability are crucial for soil quality. Film mulching and phosphorus (P) application are important agricultural practices on the semiarid Loess Plateau. This study analyzed the combined effects of film mulching and P application on SOC, its fractions, and mineralization kinetics under alfalfa ( Medicago sativa L.). The six-year field experiment incorporated randomized blocks of split-plot design with two mulching treatments (no film mulching with flat planting and film mulching with ridges and furrows) as main plots and four P levels (P0: 0 kg ha −1 , P1: 9.73 kg ha −1 , P2: 19.3 kg ha −1 , P3: 28.9 kg ha −1 ) as subplots. Mulching increased SOC content, SOC fractions (light and heavy fraction organic C, microbial biomass C, and dissolved organic C), and mineralization. After six years, mulching increased SOC content by 2.18, 2.60, 2.37, and 0.17 g kg −1 at P0, P1, P2, and P3, relative to no mulching. With increasing P levels, SOC fractions and mineralization increased under no mulching but increased initially and then decreased under mulching. P1 with mulching displayed the highest SOC utilization efficiency and stability. Kinetic models divided SOC into an active and a slow SOC pool, with the latter showing the lowest decomposability and highest stability in P1 with mulching. Overall, film mulching with a low P level, especially 11.9 kg ha −1 P fertilizer, promoted SOC storage under alfalfa on the semiarid Loess Plateau due to the high SOC content with high C utilization efficiency and stability and low decomposability.

Suggested Citation

  • Yan-Jie Gu & Cheng-Long Han & Meng Kong & Kadambot H. M. Siddique & Feng-Min Li, 2022. "Film Mulching with Low Phosphorus Application Improves Soil Organic Carbon and Its Decomposability in a Semiarid Agroecosystem," Agriculture, MDPI, vol. 12(6), pages 1-17, June.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:6:p:816-:d:832139
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    References listed on IDEAS

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    1. Christian P. Giardina & Michael G. Ryan, 2000. "Evidence that decomposition rates of organic carbon in mineral soil do not vary with temperature," Nature, Nature, vol. 404(6780), pages 858-861, April.
    2. Pinheiro, Érika Flávia Machado & de Campos, David Vilas Boas & de Carvalho Balieiro, Fabiano & dos Anjos, Lúcia Helena Cunha & Pereira, Marcos Gervasio, 2015. "Tillage systems effects on soil carbon stock and physical fractions of soil organic matter," Agricultural Systems, Elsevier, vol. 132(C), pages 35-39.
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